0000000000082228

AUTHOR

Ulf T. Eysel

showing 5 related works from this author

Presynaptic nitric oxide/cGMP facilitates glutamate release via hyperpolarization-activated cyclic nucleotide-gated channels in the hippocampus

2011

In hippocampal neurons, synaptic transmission is affected by a variety of modulators, including nitric oxide (NO), which was proposed as a retrograde messenger as long as two decades ago. NO signals via two NO-sensitive guanylyl cyclases (NO-GCs) (NO-GC1 and NO-GC2) and the subsequent increase in cGMP. Lack of long-term potentiation in mice deficient in either one of the two NO-GCs demonstrates the involvement of both NO-GCs in synaptic transmission. However, the physiological consequences of NO/cGMP and the cellular mechanisms involved are unknown. Here, we analyzed glutamatergic synaptic transmission, most likely reflecting glutamate release, in the hippocampal CA1 region of NO-GC knockou…

General NeuroscienceGlutamate receptorLong-term potentiationHyperpolarization (biology)BiologyNeurotransmissionNitric oxideCell biologychemistry.chemical_compoundGlutamatergicBiochemistrychemistryRetrograde signalingSoluble guanylyl cyclaseEuropean Journal of Neuroscience
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Metaplasticity of horizontal connections in the vicinity of focal laser lesions in rat visual cortex

2010

Focal cortical injuries are accompanied by a reorganization of the adjacent neuronal networks. An increased synaptic plasticity has been suggested to mediate, at least in part, this functional reorganization. Previous studies showed an increased long-term potentiation (LTP) at synapses formed by ascending fibres projecting onto layers 2/3 pyramidal cells following lesions in rat visual cortex. This could be important to establish new functional connections within a vertical cortical column. Importantly, horizontal intracortical connections constitute an optimal substrate to mediate the functional reorganization across different cortical columns. However, so far little is known about their p…

PhysiologyChemistryLong-term potentiationLesionCellular mechanismmedicine.anatomical_structureVisual cortexCerebral cortexSynaptic plasticityMetaplasticitymedicinemedicine.symptomNeuroscienceCortical columnThe Journal of Physiology
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Reduced presynaptic efficiency of excitatory synaptic transmission impairs LTP in the visual cortex of BDNF-heterozygous mice

2006

The neurotrophin brain-derived neurotrophic factor (BDNF) plays an important role in neuronal survival, axonal and dendritic growth and synapse formation. BDNF has also been reported to mediate visual cortex plasticity. Here we studied the cellular mechanisms of BDNF-mediated changes in synaptic plasticity, excitatory synaptic transmission and long-term potentiation (LTP) in the visual cortex of heterozygous BDNF-knockout mice (BDNF(+/-)). Patch-clamp recordings in slices showed an approximately 50% reduction in the frequency of miniature excitatory postsynaptic currents (mEPSCs) compared to wild-type animals, in the absence of changes in mEPSC amplitudes. A presynaptic impairment of excita…

N-MethylaspartatePatch-Clamp TechniquesTime FactorsLong-Term PotentiationPresynaptic TerminalsAMPA receptorIn Vitro TechniquesSynaptic TransmissionMicePostsynaptic potentialQuinoxalinesExcitatory Amino Acid AgonistsAnimalsalpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic AcidVisual CortexMice KnockoutNeuronsBrain-derived neurotrophic factorDose-Response Relationship DrugPost-tetanic potentiationChemistryBrain-Derived Neurotrophic FactorGeneral NeuroscienceDose-Response Relationship RadiationLong-term potentiationElectric StimulationSynaptic fatigueAnimals Newbornnervous systemSynaptic plasticityExcitatory postsynaptic potentialCalciumExcitatory Amino Acid AntagonistsNeuroscienceEuropean Journal of Neuroscience
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Changes in NMDA-receptor function in the first week following laser-induced lesions in rat visual cortex.

2011

Focal brain injuries are accompanied by processes of functional reorganization that partially compensate the functional loss. In a previous study, extracellular recordings at the border of a laser-induced lesion in the visual cortex of rats showed an enhanced synaptic plasticity, which was mediated by the activity of NR2B-contaning NMDA-receptors (NMDARs) shedding light on the potential cellular mechanisms underlying this reorganization. Given the potentially important contribution of NMDARs in processes of functional reorganization, in the present study, we used the same lesion model to further investigate lesion-induced changes in function and localization of NMDARs in the vicinity of the…

Neuronal Plasticitymusculoskeletal neural and ocular physiologyCognitive NeuroscienceLasersBiologyReceptors N-Methyl-D-AspartateRatsLesionCellular and Molecular NeuroscienceGlutamatergicmedicine.anatomical_structureVisual cortexnervous systemCerebral cortexSynaptic plasticityNeuroplasticitymedicineNMDA receptorAnimalsmedicine.symptomRats WistarReceptorNeuroscienceVisual CortexCerebral cortex (New York, N.Y. : 1991)
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Postsynaptic NO/cGMP Increases NMDA Receptor Currents via Hyperpolarization-Activated Cyclic Nucleotide-Gated Channels in the Hippocampus

2013

The nitric oxide (NO)/cyclic guanosine monophosphate (cGMP) signaling cascade participates in the modulation of synaptic transmission. The effects of NO are mediated by the NO-sensitive cGMP-forming guanylyl cyclases (NO-GCs), which exist in 2 isoforms with indistinguishable regulatory properties. The lack of long-term potentiation (LTP) in knock-out (KO) mice deficient in either one of the NO-GC isoforms indicates the contribution of both NO-GCs to LTP. Recently, we showed that the NO-GC1 isoform is located presynaptically in glutamatergic neurons and increases the glutamate release via hyperpolarization-activated cyclic nucleotide (HCN)-gated channels in the hippocampus. Electrophysiologi…

Patch-Clamp TechniquesCognitive NeuroscienceLong-Term PotentiationIn Vitro TechniquesNeurotransmissionNitric OxideReceptors N-Methyl-D-AspartateMiceCellular and Molecular Neurosciencechemistry.chemical_compoundCyclic nucleotidePostsynaptic potentialHyperpolarization-Activated Cyclic Nucleotide-Gated ChannelsHCN channelAnimalsAnesthetics LocalCA1 Region HippocampalCyclic GMPCyclic guanosine monophosphateMice KnockoutNeuronsbiologyLidocaineTetraethylammoniumLong-term potentiationHyperpolarization (biology)Electric StimulationPyrimidinesAnimals Newbornnervous systemchemistryGuanylate CyclaseBiophysicsbiology.proteinNMDA receptorExcitatory Amino Acid AntagonistsNeuroscienceCerebral Cortex
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